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#include "scan.h"
/* parse a netstring, input buffer is in (len bytes).
* if parsing is successful:
* *dest points to string and *slen is size of string
* return number of bytes parsed
* else
* return 0
* Note: *dest will point inside the input buffer!
*/
size_t scan_netstring(const char* in,size_t len,char** dest,size_t* slen) {
// [len]":"[string]","
// 3:foo,3:bar,4:fini,
unsigned long l;
size_t n=scan_ulongn(in,len,&l);
if (!n || /* did not start with a number */
n+2+l<l || /* overflow */
n+2+l>len || /* longer than we have input data */
in[n]!=':' || /* syntax error */
in[n+l+1]!=',')
return 0;
*dest=(char*)in+n+1;
*slen=l;
return n+2+l;
}
#ifdef UNITTEST
#include <assert.h>
#undef UNITTEST
#include "scan_ulongn.c"
int main() {
char buf[]="12:hello world!,";
char* s;
size_t l;
const char* orig;
assert(scan_netstring(buf,16,&s,&l)==16 && s==buf+3 && l==12);
orig="3:foo,"; assert(scan_netstring(orig,6,&s,&l)==6 && s==orig+2 && l==3);
orig="4294967295:foo,"; assert(scan_netstring(orig,15,&s,&l)==0);
orig="18446744073709551615:foo,"; assert(scan_netstring(orig,25,&s,&l)==0);
}
#endif